/* call-seq:
 *   window.isOpened()  -> true or false
 *
 * This function returns whether or not the window exists. Note that a hidden window (Show(false)) will return true.
 */
static VALUE Window_IsOpened( VALUE self )
{
        sf::Window *object = NULL;
        Data_Get_Struct( self, sf::Window, object );
        if( object->IsOpened() == true )
        {
                return Qtrue;
        }
        else
        {
                return Qfalse;
        }
}